Baby Grunting and Straining

When to get help

Call emergency services now — 999 in the UK, 112 or 999 in Ireland and across the EU, 911 in the US and Canada, 000 in Australia, 111 in New Zealand — if the grunting is coming with the breathing: a short sound at the end of each breath out, repeating on breath after breath, whether or not your baby is straining.

NICE guideline NG254 lists grunting in the high-risk column of its criteria for stratifying the risk of severe illness or death from sepsis in children under five, with no rate or age qualifier attached, and NICE NG143 lists it as a red feature in a child with fever. It sits alongside a respiratory rate of 60 breaths a minute or more in a baby under one, apnoea, cyanosis of the skin, lips or tongue, and a baby who does not wake or does not stay awake.

Call emergency services too if grunting comes with chest indrawing, blue or grey lips, a floppy baby, a temperature of 38°C or higher in a baby under three months, or a baby who is too breathless to feed.

Seek same-day advice — NHS 111 in the UK, GP or out-of-hours in Ireland, paediatrician in the US or Canada, healthdirect on 1800 022 222 in Australia, Healthline on 0800 611 116 in New Zealand — if your baby is straining and the stools are hard, dry or pellet-like, if there is blood on the outside of a stool, if straining is accompanied by vomiting or a swollen tummy, or if your baby seems in genuine pain rather than simply working hard.

Telling them apart in a minute

Undress your baby to the nappy and watch for sixty seconds in good light. Ask three questions.

Is the sound tied to breathing out, or to pushing? Respiratory grunting comes at the end of the out-breath, rhythmically, in time with breathing. Straining grunting comes in bursts, with a pause, with a red face and a bearing-down effort, and stops between attempts.

Does it stop? Straining stops when the stool arrives, or when your baby gives up and falls asleep. Respiratory grunting does not stop; it continues while your baby is asleep, while being carried, and between nappies.

What is the rest of the body doing? Count the breathing rate for a full minute. Look for the skin sucking in between or under the ribs, or at the base of the neck, and for the nostrils widening on each breath. Check the colour of the lips and tongue. A baby who is straining looks furious and then relieved; a baby who is grunting to breathe looks like they are working, all the time.

Why babies strain so hard

Passing a stool requires two things at once: pushing down with the abdominal muscles and relaxing the pelvic floor. Newborns are good at the first and slow to learn the second, so they push, tense everything, go red, grunt, cry, and eventually produce a completely soft stool. Lying down rather than squatting makes the mechanics harder still.

This is normal, it can look distressing, and it usually settles by a few months old as the coordination improves. The critical point is the stool itself: if what arrives is soft, the straining was not constipation, however much effort it took.

Straining is not the same as constipation

The American Academy of Pediatrics is clear that infrequent stools are not constipation if the stool is soft when it comes, and that healthy babies vary enormously in how often they go — some after every feed, some once every several days, particularly exclusively breastfed babies after the first weeks.

Constipation is defined by the stool, not the interval. NICE guidance on constipation in children turns on hard, large or pellet-like stools, pain and straining with hard stools, and, in babies, fewer than three complete stools a week alongside those features. The NHS lists dry, hard, lumpy or pellet-like stools, a firm tummy, and a baby who seems distressed as signs of constipation in children.

Straining with soft stools in a thriving baby needs nothing. Hard stools need advice.

What helps a genuinely constipated baby

For a baby under six months, get advice before changing anything. Do not add sugar, juice or anything else to bottles, do not dilute or concentrate formula, and check that formula is being made up exactly to the instructions, because an error in scoops is a common and easily fixed cause.

Gentle help in the meantime: a warm bath, bicycling the legs, a gentle clockwise tummy massage, and holding your baby in a squat-like position with knees drawn up, which makes the mechanics easier. Extra milk feeds keep fluids up.

Once a baby is over six months and on solids, small amounts of extra water with meals and fruit and vegetables that contain more fibre often help. Do not use adult laxatives, glycerin suppositories or rectal thermometers as stimulation without being told to; repeated stimulation can make a baby reliant on it.

Other noises that are not respiratory grunting

Newborns are noisy sleepers. Snuffles from a narrow nose, gurgles, squeaks, brief pauses followed by a run of quick breaths, and a general symphony of grunting sounds are all common in the first weeks. The distinction is again rhythm and persistence: intermittent noises that change with position and settle when your baby is picked up are ordinary, while a repeated sound at the end of every out-breath, with increased effort, is not.

If you are unsure, record a video with the chest visible and the room quiet. Twenty seconds of footage answers this question faster than any description, and it is the single most useful thing to bring to a phone consultation.

The rule to keep

Straining that produces a soft stool is a normal newborn skill being learned. Grunting that comes with every breath out is a warning sign in national guidance and does not belong in a wait-and-see plan. If you cannot decide which you are hearing after a minute of watching, treat it as the breathing one and ring.